_locale_rebuild_js

_locale_rebuild_js($langcode = NULL)

function _locale_rebuild_js($langcode = NULL) {
  $config = \Drupal::config('locale.settings');
  if (!isset($langcode)) {
    $language = \Drupal::languageManager()->getCurrentLanguage();
  }
  else {
    // Get information about the locale.
    $languages = \Drupal::languageManager()->getLanguages();
    $language = $languages[$langcode];
  }

  // Construct the array for JavaScript translations.
  // Only add strings with a translation to the translations array.
  $conditions = array(
    'type' => 'javascript',
    'language' => $language->getId(),
    'translated' => TRUE,
  );
  $translations = array();
  foreach (\Drupal::service('locale.storage')->getTranslations($conditions) as $data) {
    $translations[$data->context][$data->source] = $data->translation;
  }

  // Construct the JavaScript file, if there are translations.
  $data_hash = NULL;
  $data = $status = '';
  if (!empty($translations)) {
    $data = array(
      'strings' => $translations,
    );

    $locale_plurals = \Drupal::service('locale.plural.formula')->getFormula($language->getId());
    if ($locale_plurals) {
      $data['pluralFormula'] = $locale_plurals;
    }

    $data = 'window.drupalTranslations = ' . Json::encode($data) . ';';
    $data_hash = Crypt::hashBase64($data);
  }

  // Construct the filepath where JS translation files are stored.
  // There is (on purpose) no front end to edit that variable.
  $dir = 'public://' . $config->get('javascript.directory');

  // Delete old file, if we have no translations anymore, or a different file to
  // be saved.
  $locale_javascripts = \Drupal::state()->get('locale.translation.javascript') ? : array();
  $changed_hash = !isset($locale_javascripts[$language->getId()]) || ($locale_javascripts[$language->getId()] != $data_hash);
  if (!empty($locale_javascripts[$language->getId()]) && (!$data || $changed_hash)) {
    file_unmanaged_delete($dir . '/' . $language->getId() . '_' . $locale_javascripts[$language->getId()] . '.js');
    $locale_javascripts[$language->getId()] = '';
    $status = 'deleted';
  }

  // Only create a new file if the content has changed or the original file got
  // lost.
  $dest = $dir . '/' . $language->getId() . '_' . $data_hash . '.js';
  if ($data && ($changed_hash || !file_exists($dest))) {
    // Ensure that the directory exists and is writable, if possible.
    file_prepare_directory($dir, FILE_CREATE_DIRECTORY);

    // Save the file.
    if (file_unmanaged_save_data($data, $dest)) {
      $locale_javascripts[$language->getId()] = $data_hash;
      // If we deleted a previous version of the file and we replace it with a
      // new one we have an update.
      if ($status == 'deleted') {
        $status = 'updated';
      }
      // If the file did not exist previously and the data has changed we have
      // a fresh creation.
      elseif ($changed_hash) {
        $status = 'created';
      }
      // If the data hash is unchanged the translation was lost and has to be
      // rebuilt.
      else {
        $status = 'rebuilt';
      }
    }
    else {
      $locale_javascripts[$language->getId()] = '';
      $status = 'error';
    }
  }

  // Save the new JavaScript hash (or an empty value if the file just got
  // deleted). Act only if some operation was executed that changed the hash
  // code.
  if ($status && $changed_hash) {
    \Drupal::state()->set('locale.translation.javascript', $locale_javascripts);
  }

  // Log the operation and return success flag.
  $logger = \Drupal::logger('locale');
  switch ($status) {
    case 'updated':
      $logger->notice('Updated JavaScript translation file for the language %language.', array('%language' => $language->getName()));
      return TRUE;

    case 'rebuilt':
      $logger->warning('JavaScript translation file %file.js was lost.', array('%file' => $locale_javascripts[$language->getId()]));
      // Proceed to the 'created' case as the JavaScript translation file has
      // been created again.

    case 'created':
      $logger->notice('Created JavaScript translation file for the language %language.', array('%language' => $language->getName()));
      return TRUE;

    case 'deleted':
      $logger->notice('Removed JavaScript translation file for the language %language because no translations currently exist for that language.', array('%language' => $language->getName()));
      return TRUE;

    case 'error':
      $logger->error('An error occurred during creation of the JavaScript translation file for the language %language.', array('%language' => $language->getName()));
      return FALSE;

    default:
      // No operation needed.
      return TRUE;
  }
}